arch/sh/kernel/cpu/sh4a/clock-sh7770.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh4a/clock-sh7770.c
   4  *
   5  * SH7770 support for the clock framework
   6  *
   7  *  Copyright (C) 2005  Paul Mundt
   8  */
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <asm/clock.h>
  12 #include <asm/freq.h>
  13 #include <asm/io.h>
  14
  15 static int ifc_divisors[] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  16 static int bfc_divisors[] = { 1, 1, 1, 1, 1, 8,12, 1 };
  17 static int pfc_divisors[] = { 1, 8, 1,10,12,16, 1, 1 };
  18
  19 static void master_clk_init(struct clk *clk)
  20 {
  21         clk->rate *= pfc_divisors[(__raw_readl(FRQCR) >> 28) & 0x000f];
  22 }
  23
  24 static struct sh_clk_ops sh7770_master_clk_ops = {
  25         .init           = master_clk_init,
  26 };
  27
  28 static unsigned long module_clk_recalc(struct clk *clk)
  29 {
  30         int idx = ((__raw_readl(FRQCR) >> 28) & 0x000f);
  31         return clk->parent->rate / pfc_divisors[idx];
  32 }
  33
  34 static struct sh_clk_ops sh7770_module_clk_ops = {
  35         .recalc         = module_clk_recalc,
  36 };
  37
  38 static unsigned long bus_clk_recalc(struct clk *clk)
  39 {
  40         int idx = (__raw_readl(FRQCR) & 0x000f);
  41         return clk->parent->rate / bfc_divisors[idx];
  42 }
  43
  44 static struct sh_clk_ops sh7770_bus_clk_ops = {
  45         .recalc         = bus_clk_recalc,
  46 };
  47
  48 static unsigned long cpu_clk_recalc(struct clk *clk)
  49 {
  50         int idx = ((__raw_readl(FRQCR) >> 24) & 0x000f);
  51         return clk->parent->rate / ifc_divisors[idx];
  52 }
  53
  54 static struct sh_clk_ops sh7770_cpu_clk_ops = {
  55         .recalc         = cpu_clk_recalc,
  56 };
  57
  58 static struct sh_clk_ops *sh7770_clk_ops[] = {
  59         &sh7770_master_clk_ops,
  60         &sh7770_module_clk_ops,
  61         &sh7770_bus_clk_ops,
  62         &sh7770_cpu_clk_ops,
  63 };
  64
  65 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  66 {
  67         if (idx < ARRAY_SIZE(sh7770_clk_ops))
  68                 *ops = sh7770_clk_ops[idx];
  69 }
  70